Correct option is B
Classification of Zones for Permissible Moisture Content of Timber
(As per IS 287:1993)
India is broadly divided into four climatic zones for specifying the permissible moisture content of timber used for different purposes.
This classification is based on data collected by the Forest Research Institute, considering seasonal variations in timber moisture content at 12 locations across India, along with published meteorological humidity data.
Zone Classification:
Zone I: Average annual relative humidity less than 40%
Zone II: Average annual relative humidity between 40% and 50%
Zone III: Average annual relative humidity above 50% and up to 67%
Zone IV: Average annual relative humidity greater than 67%
